Answer:
Fortinbras thinks Hamlet is mad with power
and ambition
Explanation:
In the book Hamlet by William Shakespeare, Hamlet becomes mad and there are different theories as to why he lost his mind.
Polonius believes that Hamlet has gone mad because of his love for Ophelia, Gertrude believes he became mad because of the death of his father, Ophelia, who he pines for believes he has simply gone mad without reason.
However, the theory that was not proposed for Hamlet's madness was Fortinbras thinking that Hamlet has gone mad with power and ambition.